Fixes unused var and avoid reassigning keys

Changed code so key doesn't get reassigned in loop
Made use of filtr variable

library/setup

@@ -1105,9 +1105,9 @@ def run_setup(module):
     filtr = module.params['filter']
 
     for (k, v) in facts.items():
-        k = "ansible_%s" % k.replace('-', '_')
-        if fnmatch.fnmatch(k, module.params['filter']):
-            setup_options[k] = v
+        k2 = "ansible_%s" % k.replace('-', '_')
+        if fnmatch.fnmatch(k2, filtr):
+            setup_options[k2] = v
 
     # if facter is installed, and we can use --json because
     # ruby-json is ALSO installed, include facter data in the JSON
@@ -1121,9 +1121,9 @@ def run_setup(module):
             facter = False
         if facter:
             for (k,v) in facter_ds.items():
-                k = "facter_%s" % k
-                if fnmatch.fnmatch(k, module.params['filter']):
-                    setup_options[k] = v
+                k2 = "facter_%s" % k
+                if fnmatch.fnmatch(k2, filtr):
+                    setup_options[k2] = v
 
     # ditto for ohai, but just top level string keys
     # because it contains a lot of nested stuff we can't use for
@@ -1140,7 +1140,7 @@ def run_setup(module):
             for (k,v) in ohai_ds.items():
                 if type(v) == str or type(v) == unicode:
                     k2 = "ohai_%s" % k.replace('-', '_')
-                    if fnmatch.fnmatch(k2, module.params['filter']):
+                    if fnmatch.fnmatch(k2, filtr):
                         setup_options[k2] = v
 
     setup_result = {}